Magnetic recording medium production method

Abstract

A magnetic recording medium production method which includes forming a lubricating layer over a stack including a substrate, a magnetic recording layer over the substrate, and a protective layer over the magnetic recording layer includes applying a first lubricant and a second lubricant to the stack; burnishing a surface of the stack with an abrasive; and removing the second lubricant over the stack. The application of the second lubricant is performed through dipping or spin coating. A dissolution amount of the second lubricant in a solvent for the second lubricant used in the dipping or the spin coating is more than a dissolution amount of the first lubricant in the solvent. The burnishing includes abrading the surface of the stack by pressing a tape containing the abrasive against the surface of the stack. The removal of the second lubricant includes irradiating the stack with ultraviolet radiation, or heating the stack.

What is claimed is: 
     
         1 . A magnetic recording medium production method which includes forming a lubricating layer over a stack including a substrate, a magnetic recording layer over the substrate, and a protective layer over the magnetic recording layer, the magnetic recording medium production method comprising:
 applying a first lubricant and a second lubricant to the stack;   burnishing, with an abrasive, a surface of the stack to which the first lubricant and the second lubricant are applied; and   removing the second lubricant over the stack, wherein   the application of the second lubricant is performed through dipping or spin coating,   a dissolution amount of the second lubricant in a solvent for the second lubricant used in the dipping or the spin coating is more than a dissolution amount of the first lubricant in the solvent,   the burnishing includes abrading the surface of the stack by pressing a tape containing the abrasive against the surface of the stack, and   the removal of the second lubricant includes irradiating the stack, to which the first lubricant and the second lubricant are applied, with ultraviolet radiation, or heating the stack, to which the first lubricant and the second lubricant are applied.   
     
     
         2 . The magnetic recording medium production method according to  claim 1 , wherein
 an average molecular weight of the second lubricant is 300 to 1,000, and   the second lubricant includes two or fewer polar groups, or does not include polar groups.   
     
     
         3 . The magnetic recording medium production method according to  claim 1 , wherein
 an average molecular weight of the first lubricant is 900 to 3,000, and   the first lubricant includes four to eight polar groups.   
     
     
         4 . The magnetic recording medium production method according to  claim 1 , wherein
 a film thickness of the first lubricant applied to the stack is 5 angstroms to 10 angstroms, and   a film thickness of the second lubricant applied to the stack is 5 angstroms to 20 angstroms.   
     
     
         5 . The magnetic recording medium production method according to  claim 1 , wherein
 the irradiation of the stack with the ultraviolet radiation is performed in an inert gas atmosphere or in vacuum.   
     
     
         6 . The magnetic recording medium production method according to  claim 1 , wherein
 the heating is performed in an inert gas atmosphere.